A Cookbook download whose repo/quant selector matched no files (e.g. a ':Q4_K_M' tag that does not exist) printed 'Fetching 0 files' and was still reported as a successful '✓ Downloaded' / completed task. Detect the zero-file signature in the download snapshot and mark the task as an error with a clear diagnosis (no matching files — check the repo or quant/filename pattern) so users know nothing was actually downloaded. Normal multi-file and fully-cached downloads (which print 'Fetching N files', N>0) are unaffected. Closes #839
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103 KiB